T. Svanholm et al., ASSOCIATIVE THICKENERS - THEIR ADSORPTION BEHAVIOR ONTO LATEXES AND THE RHEOLOGY OF THEIR SOLUTIONS, Progress in organic coatings, 30(3), 1997, pp. 159-165
Citations number
39
Categorie Soggetti
Chemistry Applied","Materials Science, Coatings & Films
The interaction between an associative thickeners in solution and an a
nionic surfactant has been studied with rheology and surface tension m
easurements, Both a HEUR thickener and low molecular weight HMHEC thic
kener interacted strongly with the surfactant. The addition of surfact
ant leads in both cases to a reinforced transient network at low and m
oderate levels of surfactant, whereas the structure is destroyed at hi
gher levels. The HMHEC thickener was found more sensitive to high surf
actant concentrations than the HEUR one. Surface tension measurements
are complementary to the rheology studies and showed hydrophobic inter
action between HEUR thickener and surfactant to be dominant over polye
thylene oxide - surfactant interaction. Adsorption of thickener to lat
ex was studied with monitoring of isotherms from depletion concentrati
on, electrokinetic measurements and ellipsometry. The HEUR thickener u
sed was found to adsorb more strongly to the latex than the surfactant
in contrast to the HMHEC thickener. (C) 1997 Elsevier Science S.A.